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Cucurbiturils (Q[7] and Q[8]) can encapsulate multinuclear platinum complexes, with encapsulation influencing their structure and binding kinetics. This suggests potential for cucurbiturils in delivering platinum-based drugs.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Cisplatin and multinuclear platinum complexes are important in cancer therapy.
  • Cucurbiturils are macrocyclic hosts with potential for molecular recognition and drug delivery.
  • Understanding host-guest interactions is crucial for designing effective drug delivery systems.

Purpose of the Study:

  • To investigate the encapsulation of cisplatin and multinuclear platinum complexes by cucurbiturils (Q[7] and Q[8]).
  • To characterize the structural and dynamic changes of platinum complexes upon encapsulation using NMR spectroscopy and molecular modeling.
  • To assess the potential of cucurbiturils as hosts for platinum-based anticancer agents.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy (1H NMR) was employed to study the binding interactions.
  • Molecular modeling was used to visualize and understand the encapsulation process and resulting complex conformations.
  • Studies involved cisplatin, cis-[PtCl(NH3)2(H2O)]+, and multinuclear platinum complexes linked by 4,4'-dipyrazolylmethane (dpzm) ligand.

Main Results:

  • Cisplatin showed partial binding within cucurbituril cavities, while cis-[PtCl(NH3)2(H2O)]+ bound at the portals.
  • Multinuclear platinum complexes were quantitatively encapsulated by both Q[7] and Q[8], leading to significant upfield shifts in 1H NMR spectra.
  • Encapsulation by Q[7] induced larger spectral shifts than Q[8], indicating cavity size dependence and direct interaction with the dpzm ligand. Binding kinetics were slow on the NMR timescale for metal complexes.

Conclusions:

  • Cucurbiturils effectively encapsulate multinuclear platinum complexes, altering their conformation and dynamics.
  • The observed upfield NMR shifts confirm the close proximity of cucurbiturils to the dpzm ligand and platinum centers.
  • These findings suggest that cucurbiturils are promising candidates for the development of novel drug delivery systems for platinum-based anticancer drugs.